A105747 - cp's OEIS frontend

A105747 Number of ways to use the elements of {1,..,k}, 0<=k<=2n, once each to form a collection of n (possibly empty) lists, each of length at most 2.

n	a(n)
0	1
1	4
2	23
3	216
4	2937
5	52108
6	1136591
7	29382320
8	877838673
9	29753600404
10	1127881002535
11	47278107653768
12	2171286661012617
13	108417864555606300
14	5847857079417024031
15	338841578119273846112

[1, 4, 23, 216, 2937, 52108, 1136591, 29382320, 877838673, 29753600404, 1127881002535, 47278107653768, 2171286661012617, 108417864555606300, 5847857079417024031, 338841578119273846112]

cp's OEIS Frontend

A105747 Number of ways to use the elements of {1,..,k}, 0<=k<=2n, once each to form a collection of n (possibly empty) lists, each of length at most 2.

Table of values

List of values